1. Carryout- usually 0, unless I'm feeling friendly and I might throw a buck or two or the change in there.
2. Pizza- I haven't ordered delivery in ages since I pickup most times but used to always be $5. We also are only feeding 2 so it's not a crazy order.
3. Dine in- 20% unless service is terrible or exemplary and then adjust accordingly.

We've gotten them as well and I too thought it was weird that they used their own address. I looked it up though and it was their name but the return address was of the local church or whatever their place of worship is called.